ClO2 Generator Acid Recycling

Throughout the Pulp & Paper industry, chlorine dioxide (ClO2) is used in the pulp-bleaching process. ClO2 generators chemically convert sodium chlorate to chlorine dioxide and sodium sulfate in a strong solution of sulfuric acid. The acid is continuously purged from the generator in order to prevent the accumulation of sodium sulfate. Separation of ClO2 generator’s waste streams allows for the recycling of the sulfuric acid. Without splitting the streams, the effluent has a very high acid content which consumes alkalinity in the Kraft liquor.

In order to counter the acid level, large quantities of caustic soda is consumed. The Eco-Tec GAP™ System is designed to separate the sulfuric acid from the sodium sulfate by employing the use of the Eco-Tec APU® System – known worldwide as the standard for separating salts from mineral acids in metal processing industries. The resin used in the APU® system absorbs the acid while allowing the salt solution to pass through.

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Eco-Tec designs, develops, and manufactures equipment for industrial water treatment and purification of chemicals and gases. Our products incorporate advanced, proprietary designs which improve performance, economy, and reliability in their operations, while facilitating environmental responsibility. In business since 1970, we have supplied over 2,000 systems in 60 countries.